But to me aside all this other reason I have made mention, One other major reason is because of the freedom it brings unlike the traditional way fiat currency system that is completely centralized and controlled by the government.
You only can have it if you don't handle your ownership and control to any party like centralized exchanges or custodial and close source wallets.
To achieve what you wanted to have, you must use non custodial wallets, and it needs to be open source too. Then create your wallet, back up your wallet seed phrase, private key, and the backup can be used for recovery. You will have complete control of your bitcoin, UTXO and transaction and won't depend on governments, central banks, centralized exchanges.